The output shows 100% utilization on sdc.
Which means that this disk is saturated.

12-12-2012

Ipcipher

Quote:

Originally Posted by Irithori

Hi and welcome

The output shows 100% utilization on sdc.
Which means that this disk is saturated.

That's what I thought it said. I wasn't sure if I was reading it right. Do you know a way to find out what process are killing that drive? Would i get better performance from creating one big raid 5 array rather than two?

12-12-2012

Irithori

On more recent systems with process accounting available, e.g. atop can show a sorted list of processes using the disc. (press d)

Raid5 is not for performance, it is a datastorage with redundancy. Useable for logfiles, database dumps and the like.
- If you want performance from hardware side, go for a raid10 with lots of fast spindles (15k disks) along with one or better more capable raidcontrollers (e.g. hp smartarray p8xx) and a few jbods attached.
- From filesystem side, consider turning off atime as an easy method. There are more options too consider, but this probably is too big for an forum answer.
- Then analyse the read/write patterns. Is there workload, that can be distributed? e.g. in a database setup: have separate raids for the system (raid1), logs (raid5), dbdumps (raid5), tempdb (raid10), db data (raid10)